Anatomy of the interior of the cranium with brain removed. The reflections of the dura mater (grey) are shown. The dura is a dense connective tissue surrounding the brain and spinal cord. Blood from the brain, bones of the skull, eye and internal ear pass into the venous sinuses (blue) within the dura mater which drain into the internal jugular veins. From Sobotta, J. (1906) Atlas der deskriptiven Anatomie des Menschen. Vol 3, Das Nerven- und Gefasssystem des Menschen. J. F. Lehmann, Munchen, Fig.568.